This time-lapse video shows workers in Changsha, China building a 15-story hotel in six days:

The Ark Hotel, constructed with optimal energy, material and time savings, was reportedly not only more efficient but cheaper to make. Industry experts said there was only 1 percent construction waste.

The sustainable hotel already had its foundation so construction workers only took 46 hours to finish the building using pre-fabricated columns and modules as well as modern construction techniques. Once the main structural components were completed, only another 90 hours were required to finish the building enclosure.